Expansion-bolt.



A. c. BARRETT.

EXPANSION BOLT.

I .APPLIGATION FILED JU N E 1 5 1 9 l 4.

1,116,545, Patented Nov. 10, 1914.

i v lW//// a 1 NZ 415 a. wall or the like. Fin.

UNITED STATES PATENT OFFICE.

ARTHUR C. BARRETT, OF CHICAGO, ILLINOIS.

EXPANSIONJBOLT.

Specification of Letters Patent.

Application filed June 15, 1914.

Patented N ov. 10,191 t. Serial No. 845,311.

all whom it may concern:

lie it known that I, An'rnin: C. BAR- nu'rr, a citizen of the United States of America, and a resident of (hit-ago, in the 5 county of Cook, State of lllinois, have invented certain new and useful Improve meats in l lxpansion-Bolts, of which the following' is a specification.

This invention relates more particularly 3.0 to that tvpe of expansion bolts in which a longitudinally divided two part sleeve is adapted to receive "a lag; or like screw-bolt, and with which the placing of said screwbolt, is adapted to expand the divided sleeve into holding engagement with the walls of a receiviiig socket or orifice formed therefor in a wall or the like. And the present im' provement has for its main object to provide a simple and eiiicient structural formation of sections connn'ising the expanding in said socket to ithdra a] or worle ing" out.

A further object is to provide a simple and effective formation of the forward end of the expanding sleeve, whereby any lateral 0 play of the forward end of the sleeve in its receiving socket, as well as a rotation of the sleeve, is prevented.

A still further object is to provide a strong and ciiicicnt connection between the sections of the expanding sleeve, and by which said sections are held with their internal screwthreads in proper pitch relation during the initial driving operation, as well as in shipment and ordinary handling. All as will hereinafter more fully appear.

In the accompanying drawings: Figure 1, is a sectional elevation illustrating the present" expansion bolt, in an expanded condition in a'sockct orifice formed therefor in y 2, is a side elevation of the longitudinall ('vided sleeve of an expansion bolt cmbodviny: the. present improvements. Fig. 3, is an elevation showing' the interior of one of the sections of the sleeve. Fig. 4. a transverse section on linea' a". Fin. 2. Fin. 5, is a similar view on line ;'l. -i), Fig. 2. Fig. (l, is an elevation of the rear and smaller end of the sleeve.

Similar reference numerals indicate like parts in the several views.

Referring to the drawings, 2 represents the expansion sleeve split or divided longitndnially throughout its length into two substantially counterpart sections 3 and l, and formed with a cylindrical tapering bore havmg an expanded smooth portion 5 at its forward and larger end, and a threaded porllOll (i at its rear and smaller end. And such smooth portion 5 of the bore is adapted to receive and accommodate the unthreaded shank portion of an ordinary lag screw or bolt 1, as usual in the present type of expansion bolts, and as illustrated in Fig. 1.

8 are a series of teeth or serrations formed on the exterior of the sleeve sections 3 and 4. In a longitudinal direction said teeth are preferably of the ordinary triangular form shown. while in a transverse direction, said teeth in the present invention will have a semi-circular form at their base or point of connection with the next adjac it tooth, and semi-elliptical at their crowns as shown, With such special transverse formation of the teeth or serrations 8, an elliptical form is imparted to the main body, of the longi tudinally divided expansion sleeve 2, which is adapted to provide ample side clearance to the sleeve as the same is driven into the ordinary round orifice or socket that is divided in a wall or the. like for the reception of said sleeve. With the described side clear ance and the elliptical crowns of the teeth 8, the resistance to the initial driving of the expansion sleeve 2 into place, is confined to the crowns of the teeth or serrations 8 aforesaid, so that but a minimum degree of frictional resistance is met in such driving operation, and in consequence any liability to independent movement of one sleeve section with relation to the other. and the resulting displacement of the pitch relation of the screw-threaded portions 6 of saidsectious is reduced to a minimum. Accordingly there is much less breaking strain imposed during; the driving operation upon the hereinafter described means by which the sleeve sections 3 and 4 are held in proper assembled relation.

9 is a terminal cone at the forward end of the longitudinally divided expansion sleeve 2, and having a slightly larger diameter than the major diameter of the main body of the sleeve at the crowns of its teeth or serrations 8 and adapting the. front end of the expansion sleeve to seat itself snugly in the wall socket or orifice mad to re- 1 ceive the sleeve, which socket or orifice as ordinarily drilled 1s flared more or less at its outer end, 1 3 are a pair of diametrically disposed ribs. or tins formed on the terminal cone 9 aforesaid, and which act to wedge the forward end of the expansion sleeve firmly in the flaring end of the receiving socket or orifice, againsta tendency to turn as the lag screw or bolt is screwed into place in said" sleeve.

11 are a pair of tangentially disposed holding ears or lugs formed on the terminal cone portion of the sleeve section 4, and 12 are a pair of counterpart surface recesses formed in the exterior of the terminal cone portion of the companion sleeve section 3 and separated from the inner bore thereof by bottom webs 13, as shown. With the de scribed construction aforesaid lugs 11 are bent into the aforesaid recesses and against the bottom webs 13 thereof, to effect a yielding attachment between the forward portions of the sleeve sections 3 and 4:, and maintain such sleeve sections in proper relation to each other during the operation or" applying the present expansion sleeve to a socket. orifice formed therefor in a wall or like structure. By the above described formation of the recess 12- and its bottom web 13 in the enlarged forward portion 01"" the sleeve section 3 of the present structure ample depth of the recess 12 is obtained, without any increase in the diameter of the rear and main portion of the structure, wherein a minimum diameter is a desirable commercial feature.

The mode of using as well as the general operation of the parts are the same as the ordinary lag screw expansion bolts nowj general use in the arts,'-and do not require a detailed description. I

llaving thus fully described my said in- 1 vention what I claim as new and desire to secure by Letters Patent, is

in an expansion bolt, an expansion sleeve comprising two longitudinal sections connected together at their forward ends and fo med with a central longitudinal more which cooperates with a screw-bolt to effecta lateral spreading of the sleeve sec: tion, each section having a longitt dinally disposed series of teeth on its exterror surface, and each tooth extending transversely the width ,or thesection and formed with a semi-ellintical crown,

11 an expansion. holt, an! expansion sleeve divided longitudinally to form a pair substantially counterpart sleeve sections having at their totward ends enlarged cone portions, "one cone portion having a pair lateral holdingiears and the other cone portion having pending pair oi surface recesses andseparated from the bore eacansion sleeve hy bottom webs, and

adapted. for] engagement with said holdinl.

ears.

In an BXPfillSlOIl holt, an expansion 7 at; their bases and a semi-elliptical form at their crowns, the said sleeve sections having at their forward ends terminal cone portions, and means adjacent to said cone portions for securing the sleeve sections together.

i. In an expansion bolt, an expansion sleeve divided longitudinally to form a pair of substantiall counter-cart sleeve sections provided on their exterior with teeth or serrations which have a semi-circular form at their bases and a semi-elliptical form, at their crowns, the said sleeve-sections having at their forward ends terminal cone portions having. diametrically disposed fins on their exteriors, and means adjacent to said cone portions for securing the sleeve sections together.

5. In an expansion bolt, an expansion sleeve formed with a screw-thread in rear portion of its central bore and divided longitudinally to form a pair of substantially counterpart sleeve sections provided on their exteriors with teeth or serrations which have a semi-circnlar form at their bases and a semi-elliptical form at their crowns.

.6. In an expansion bolt, anexpansion sleeve formed a screw-thread in the rear portion of its central core divided longitudinally to form a pair ofsuhstantially counterpart sleeve sections having at their forward ends enlarged cone portions, one cone'portion having a pair of lateral holding ears and the other cone portion hava a corresponding of surface recesses separated from the here of the'expansion sleeve by bottom webs and adapted for engagernent with said holding ears.

7. an expansion colt, an expansion sleeve formed with a screw-thread in the rear portion of its central core and divided longitudinally to form a pair snhstantiallv counterpart sleeve sections provi ed on their exterior with tests: or serrat which have a semi-circ torrn their bases and a semin at their crowns, the said slesections having at their forward ends terminal cone portions, and means adjacent to said cone portions for securing" the sleeve sections together.

8. In an expansion bolt, an expansion sleeve formed with a screw-thread in the rear portion of its central here and divided longitudinally to form a pair of substaneach. have a or.

bases and a semi-elliptical form it their Signed at Chicago, Illinois, this 10th day crowns, the said sleeve sections havin at of June, 1914. i

their forward ends terminal com port 0118 having diamtrically disposed fins on their ARTHUR BARRETT exteriors, and means adjacent to said cone Witnesses:

portions for securing the sleeve sections to- Roglm'r Bonus,

gather. IVA L. CRANE.

M Copies of this natent may be obtained for five cents each, by addressing the "dommjnioner of Patents,

- Wilmington, 20.6. i 

